Spectroscopic redshift distribution of the 10 600 unique objects with secure spectroscopic redshifts (see text) in the CFHTLS-D1 field. The two lower redshift surveys, VVDS (Le Fèvre et al. 2013) and ORELSE (Lubin et al. 2009), are shown as hashed green and orange histograms, respectively. The higher redshift VUDS (Le Fèvre et al. 2014) objects are shown as a black filled histogram. The number of objects with secure spectroscopic redshifts coming from each survey along with the median z_spec of each sample is shown in the top right corner. For the sake of clarity, the bin size of the histograms for the VUDS and ORELSE objects are twice that of the VVDS. Though it is not apparent from the diagram, there is a tail of galaxies with z_spec> 5 confirmed from the VUDS survey.